IBM System x3550 M3 Type 4254

AC power-supply LEDs
Description Action NotesAC DC Error (!)
Off On Off Faulty
power-supply
Replace the power supply.
Off On On Faulty
power-supply
Replace the power supply.
On Off Off Power-supply not
fully seated, faulty
system board, or
faulty
power-supply
1. Reseat the power supply.
2. If a power channel error LED
on the system board is not
lit, replace the power-supply
(see the documentation that
comes with the power supply
for instructions).
3. If a power channel error LED
on the system board is lit,
(trained service technician
only) replace the system
board.
Typically indicates a
power-supply is not
fully seated.
On Off On Faulty
power-supply
Replace the power supply.
On On On Power-supply is
faulty but still
operational
Replace the power supply.
DC power-supply LEDs:
Use this information to view DC power-supply LEDs.
The following illustration shows the locations of the power-supply LEDs on the dc
power supply.
The following table describes the problems that are indicated by various
combinations of the power-supply LEDs on a dc power supply and suggested
actions to correct the detected problems.
DC power-supply LEDs
Description Action NotesIN OK OUT OK Error (!)
On On Off Normal operation
-48V return
Ground
-48V
Power input LED
Power output LED
Power error LED
Figure 13. DC power-supply LEDs
30 IBM System x3550 M3 Type 4254 and 7944: Installation and User's Guide